Orange stool?

Every single time I eat, I have to go to the bathroom almost immediately.
Sometimes before I am even done eating.
The past few days, after I eat, I go to the bathroom, which is not unusual, but my stool has been orange.
But it is only after I eat and have to go to the bathroom straight away.
When I go normally, it is just regular.
I am having a lower GI done next week, but I am curious as to what this could be.
I also have constant stomach aches.
They never go away, but sometimes, they get really really bad.
They only ever hurt badly on the left side though.
Any input would be appreciated.
[Don't worry. I am currently going to about a million specialists, maybe slightly over exaggerated ]